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📐 Bend Allowance Calculator
Calculate bend allowance and flat pattern length for sheet metal bending
📐 Bend Allowance Formulas
BA = (π/180) × (R + K×T) × A
K = 0.33 (for most materials)
Flat Length = L₁ + L₂ + BA
Bend Deduction = 2×OSSB - BA
BA = bend allowance, R = inside radius, T = thickness, A = bend angle, K = K-factor
Bend Allowance:
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Flat Pattern Length:
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Bend Deduction:
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Outside Setback:
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💡 Tips & Information
- K-factor typically ranges from 0.25 to 0.5
- Smaller radius = higher bend allowance
- Thicker materials require larger bend radius
- Used in sheet metal fabrication and design
- Bend allowance compensates for material stretching